﻿310 
  KEPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  deep 
  fissure 
  seems 
  to 
  separate 
  the 
  episternal 
  from 
  the 
  epimeral 
  area, 
  

   and 
  the 
  epimerum 
  rests 
  above 
  the 
  trochantine, 
  being 
  minute, 
  rudiment- 
  

   ary, 
  and 
  triangular 
  in 
  outline. 
  The 
  coxa 
  is 
  very 
  large, 
  broad, 
  enor- 
  

   mous 
  compared 
  with 
  other 
  Orthoptera; 
  it 
  is 
  much 
  flattened. 
  The 
  tro- 
  

   chantine 
  Is 
  long 
  and 
  narrow, 
  the 
  suture 
  being 
  on 
  a 
  thin, 
  prominent 
  

   ridge. 
  

  

  Metapleurum. 
  (PI. 
  XXXI.) 
  Exactly 
  repeats 
  the 
  mesopleurum 
  in 
  

   form, 
  but 
  is 
  a 
  little 
  larger, 
  and 
  the 
  coxae 
  are 
  somewhat 
  larger. 
  

  

  Owing 
  to 
  the 
  much 
  depressed, 
  flattened 
  body, 
  which 
  is 
  correlated 
  to 
  

   the 
  habit 
  of 
  living 
  under 
  the 
  bark 
  df 
  trees 
  and 
  in 
  cracks, 
  the 
  episterna 
  

   are 
  only 
  seen 
  from 
  beneath, 
  on 
  each 
  side 
  of 
  the 
  sternum, 
  and 
  the 
  epi- 
  

   mera 
  are 
  reduced 
  nearly 
  to 
  a 
  minimum, 
  while 
  the 
  coxse 
  are 
  enormous, 
  

   but 
  still 
  flattened, 
  as 
  the 
  Blattariae 
  are 
  active 
  runners 
  rather 
  than 
  

   leapers. 
  

  

  Sternum. 
  

  

  The 
  prosternum 
  (PI. 
  XXXI) 
  is 
  well 
  developed, 
  but 
  one-half 
  as 
  broad 
  as 
  

   long, 
  and 
  submembranous. 
  

  

  The 
  mesosternum 
  (PI. 
  XXXII) 
  is 
  about 
  as 
  broad 
  as 
  long, 
  rounded 
  

   behind, 
  with 
  a 
  median 
  angular 
  depression. 
  

  

  The 
  metasternum 
  (PI. 
  XXXII) 
  is 
  broader 
  than 
  long, 
  deeply 
  cleft, 
  with 
  

   a 
  median 
  fold 
  or 
  gore. 
  Owing 
  to 
  this 
  deep, 
  angular 
  depression 
  both 
  the 
  

   meso- 
  and 
  metasternites 
  can 
  be 
  flexed 
  together, 
  thus 
  allowing 
  the 
  sides 
  

   of 
  the 
  body 
  to 
  approach 
  each 
  other 
  somewhat. 
  

  

  THE 
  ABDOMEN. 
  

  

  There 
  are 
  in 
  the 
  9 
  eight 
  abdominal 
  tergites, 
  the 
  eighth 
  tergite 
  being 
  

   deeply 
  cleft, 
  and 
  seven 
  urosternites. 
  The 
  cercopoda 
  are 
  short 
  and 
  13-15- 
  

   jointed. 
  

  

  Note. 
  — 
  The 
  close 
  relation 
  to 
  Termes 
  and 
  the 
  Termitidse 
  in 
  general, 
  

   (a 
  point 
  in 
  which, 
  among 
  other 
  respects, 
  Blatta 
  connects 
  the 
  Orthoptera 
  

   and 
  Pseudoneuroptera), 
  is 
  seen 
  in 
  the 
  nearly 
  icfentical 
  form 
  of 
  the 
  epi- 
  

   sternal 
  and 
  ei)imeral 
  regions 
  ; 
  the 
  latter 
  being 
  dorsal 
  and 
  small, 
  the 
  

   episternal 
  more 
  developed 
  and 
  sternal 
  in 
  position. 
  The 
  sternal 
  region 
  

   is 
  much 
  the 
  same 
  in 
  Blatta 
  as 
  in 
  Termes, 
  and 
  judging 
  by 
  the 
  form 
  of 
  

   the 
  head, 
  thorax 
  and 
  abdomen, 
  these 
  two 
  genera 
  might 
  belong 
  to 
  even 
  

   the 
  same 
  family 
  They 
  seem 
  certainly 
  only 
  one 
  family 
  removed, 
  the 
  

   principal 
  differences 
  being 
  in 
  the 
  wings. 
  If^ 
  there 
  were, 
  so 
  to 
  speak, 
  no 
  

   other 
  Orthoptera 
  in 
  existence, 
  the 
  Blattarise 
  would 
  certainly 
  be 
  associ- 
  

   ated 
  with 
  the 
  Pseudoneuroptera. 
  Hence 
  we 
  have 
  been 
  almost 
  led 
  to 
  

   think 
  that 
  it 
  is 
  an 
  artificial 
  classification 
  which 
  places 
  them 
  in 
  separate 
  

   orders. 
  

  

  Mantidje. 
  

  

  THE 
  HEAD. 
  

  

  Mantis 
  Carolina, 
  The 
  position 
  of 
  the 
  head 
  is 
  vertical 
  ; 
  the 
  front 
  is 
  

   broad, 
  triangular. 
  The 
  orbits 
  are 
  very 
  large 
  and 
  broad. 
  The 
  epicra- 
  

  

  